[yorkiefan_]

I agree that a rescue would be a way better option for a student. Raising a yorkie puppy is really rewarding, but will eat a lot more of your limited time than having an adult will. When they're really young (e.g., <4.5 months) you have to constantly keep a hawk eye on them, not only for potty training, but also because they will try to chew on and eat every thing. Well, at least if Cookie is any indication; she has grown out of trying to put everything in her mouth quite a bit though, thankfully. It really is like having a toddler though early on.

My brother rescues a lot of dogs, and he uses the bells on the door. When one has an accident he walks the dog to the door, grabs its paw, and hits the bell with it. He has had a lot of success, but we're talking mostly adult mutts over 20 pounds. Yorkies are usually harder to potty train than a lot of other breeds, so I have no idea how the bells would work for you there (my brother has never fostered a yorkie).